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path: root/src/mess/drivers/abc80x.c
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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*

Luxor ABC 800C/800M

Main PCB Layout
---------------

|-----------------------|-----------------------------------|
|   4116    4116        |                                   |
|   4116    4116        |                                   |
|   4116    4116        |                                   |
|   4116    4116        |           Z80         Z80CTC      |
|   4116    4116        |CN1                                |
|   4116    4116        |                                   |
|   4116    4116        |                       Z80DART     |
|                       |                       CN6         |
|   ROM3    ROM7        |                                   |
|                       |                       Z80SIO2     |
|   ROM2    ROM6        |-----------------------------------|
|                                                           |
|   ROM1    ROM5                                            |
|                                                       CN2 |
|   ROM0    ROM4                                            |
|                       CN7                                 |
|-------------------------------------------|           CN3 |
|                                           |               |
|                                           |               |
|                                           |           CN4 |
|                                           |               |
|               VIDEO BOARD                 |               |
|                                           |           CN5 |
|                                           |               |
|                                           |               |
|                                           |               |
|-------------------------------------------|---------------|

Notes:
    Relevant IC's shown.

    Z80     - ? Z80A CPU (labeled "Z80A (800) KASS.")
    Z80CTC  - Sharp LH0082A Z80A-CTC
    Z80DART - SGS Z8470AB1 Z80A-DART
    Z8OSIO2 - SGS Z8442AB1 Z80A-SIO/2
    4116    - Toshiba TMS4116-20NL 1Kx8 RAM
    ROM0    - NEC D2732D 4Kx8 EPROM "ABC M-12"
    ROM1    - NEC D2732D 4Kx8 EPROM "ABC 1-12"
    ROM2    - NEC D2732D 4Kx8 EPROM "ABC 2-12"
    ROM3    - NEC D2732D 4Kx8 EPROM "ABC 3-12"
    ROM4    - NEC D2732D 4Kx8 EPROM "ABC 4-12"
    ROM5    - NEC D2732D 4Kx8 EPROM "ABC 5-12"
    ROM6    - Hitachi HN462732G 4Kx8 EPROM "ABC 6-52"
    ROM7    - NEC D2732D 4Kx8 EPROM "ABC 7-22"
    CN1     - ABC bus connector
    CN2     - tape connector
    CN3     - RS-232 channel B connector
    CN4     - RS-232 channel A connector
    CN5     - video connector
    CN6     - keyboard connector
    CN7     - video board connector


Video PCB Layout (Color)
------------------------

55 10789-01

|-------------------------------------------|
|                                           |
|                                           |
|               2114                        |
|                                           |
|               2114        TROM            |
|                                           |
|       12MHz               TIC             |
|                                           |
|                                           |
|-------------------------------------------|

Notes:
    Relevant IC's shown.

    2114    - GTE Microcircuits 2114-2CB 1Kx4 RAM
    TIC     - Philips SAA5020 Teletext Timing Chain
    TROM    - Philips SAA5052 Teletext Character Generator w/Swedish Character Set


Video PCB Layout (Monochrome)
-----------------------------

55 10790-02

|-------------------------------------------|
|                                           |
|               2114                        |
|               2114                        |
|                                      12MHz|
|               2114                        |
|               2114                        |
|                                           |
|               CRTC            ROM0        |
|                                           |
|-------------------------------------------|

Notes:
    Relevant IC's shown.

    2114    - Toshiba TMM314AP-1 1Kx4 RAM
    CRTC    - Hitachi HD46505SP CRTC
    ROM0    - NEC D2716D 2Kx8 EPROM "VUM SE"


Video PCB Layout (High Resolution)
----------------------------------

55 10791-01

|-------------------------------------------|
|                                           |
|   4116        PROM1                       |
|   4116                                    |
|   4116                                    |
|   4116                                    |
|   4116                                    |
|   4116                                    |
|   4116                                    |
|   4116                PROM0               |
|-------------------------------------------|

Notes:
    Relevant IC's shown.

    4116    - Motorola MCM4116AC25 1Kx8 RAM
    PROM0   - Philips 82S123 32x8 Bipolar PROM "HRU I"
    PROM1   - Philips 82S131 512x4 Bipolar PROM "HRU II"

*/

#include "includes/abc80x.h"



//**************************************************************************
//  SOUND
//**************************************************************************

//-------------------------------------------------
//  DISCRETE_SOUND( abc800 )
//-------------------------------------------------

static DISCRETE_SOUND_START( abc800 )
	DISCRETE_INPUT_LOGIC(NODE_01)
	DISCRETE_OUTPUT(NODE_01, 5000)
DISCRETE_SOUND_END


//-------------------------------------------------
//  pling_r - speaker read
//-------------------------------------------------

READ8_MEMBER( abc800_state::pling_r )
{
	m_pling = !m_pling;

	m_discrete->write(space, NODE_01, m_pling);

	return 0xff;
}


//-------------------------------------------------
//  pling_r - speaker read
//-------------------------------------------------

READ8_MEMBER( abc802_state::pling_r )
{
	m_pling = !m_pling;

	m_discrete->write(space, NODE_01, m_pling);

	return 0xff;
}



//**************************************************************************
//  MEMORY BANKING
//**************************************************************************

//-------------------------------------------------
//  bankswitch
//-------------------------------------------------

void abc800_state::bankswitch()
{
	address_space &program = m_maincpu->space(AS_PROGRAM);

	if (m_fetch_charram)
	{
		// HR video RAM selected
		program.install_ram(0x0000, 0x3fff, m_video_ram);
	}
	else
	{
		// BASIC ROM selected
		program.install_rom(0x0000, 0x3fff, m_rom->base());
	}
}


//-------------------------------------------------
//  bankswitch
//-------------------------------------------------

void abc802_state::bankswitch()
{
	address_space &program = m_maincpu->space(AS_PROGRAM);

	if (m_lrs)
	{
		// ROM and video RAM selected
		program.install_rom(0x0000, 0x77ff, m_rom->base());
		program.install_ram(0x7800, 0x7fff, m_char_ram);
	}
	else
	{
		// low RAM selected
		program.install_ram(0x0000, 0x7fff, m_ram->pointer());
	}
}


//-------------------------------------------------
//  bankswitch
//-------------------------------------------------

void abc806_state::bankswitch()
{
	address_space &program = m_maincpu->space(AS_PROGRAM);
	UINT32 videoram_mask = m_ram->size() - (32 * 1024) - 1;
	int bank;
	char bank_name[10];

	if (!m_keydtr)
	{
		// 32K block mapping

		UINT32 videoram_start = (m_hrs & 0xf0) << 11;

		for (bank = 1; bank <= 8; bank++)
		{
			// 0x0000-0x7FFF is video RAM

			UINT16 start_addr = 0x1000 * (bank - 1);
			UINT16 end_addr = start_addr + 0xfff;
			UINT32 videoram_offset = (videoram_start + start_addr) & videoram_mask;
			sprintf(bank_name,"bank%d",bank);
			//logerror("%04x-%04x: Video RAM %04x (32K)\n", start_addr, end_addr, videoram_offset);

			program.install_readwrite_bank(start_addr, end_addr, bank_name);
			membank(bank_name)->configure_entry(1, m_video_ram + videoram_offset);
			membank(bank_name)->set_entry(1);
		}

		for (bank = 9; bank <= 16; bank++)
		{
			// 0x8000-0xFFFF is main RAM

			UINT16 start_addr = 0x1000 * (bank - 1);
			UINT16 end_addr = start_addr + 0xfff;
			sprintf(bank_name,"bank%d",bank);
			//logerror("%04x-%04x: Work RAM (32K)\n", start_addr, end_addr);

			program.install_readwrite_bank(start_addr, end_addr, bank_name);
			membank(bank_name)->set_entry(0);
		}
	}
	else
	{
		// 4K block mapping

		for (bank = 1; bank <= 16; bank++)
		{
			UINT16 start_addr = 0x1000 * (bank - 1);
			UINT16 end_addr = start_addr + 0xfff;
			UINT8 map = m_map[bank - 1];
			UINT32 videoram_offset = ((map & 0x7f) << 12) & videoram_mask;
			sprintf(bank_name,"bank%d",bank);
			if (BIT(map, 7) && m_eme)
			{
				// map to video RAM
				//logerror("%04x-%04x: Video RAM %04x (4K)\n", start_addr, end_addr, videoram_offset);

				program.install_readwrite_bank(start_addr, end_addr, bank_name);
				membank(bank_name)->configure_entry(1, m_video_ram + videoram_offset);
				membank(bank_name)->set_entry(1);
			}
			else
			{
				// map to ROM/RAM

				switch (bank)
				{
				case 1: case 2: case 3: case 4: case 5: case 6: case 7:
					// ROM
					//logerror("%04x-%04x: ROM (4K)\n", start_addr, end_addr);

					program.install_read_bank(start_addr, end_addr, bank_name);
					program.unmap_write(start_addr, end_addr);
					membank(bank_name)->set_entry(0);
					break;

				case 8:
					// ROM/char RAM
					//logerror("%04x-%04x: ROM (4K)\n", start_addr, end_addr);

					program.install_read_bank(0x7000, 0x77ff, bank_name);
					program.unmap_write(0x7000, 0x77ff);
					program.install_readwrite_handler(0x7800, 0x7fff, 0, 0, READ8_DELEGATE(abc806_state, charram_r), WRITE8_DELEGATE(abc806_state, charram_w));
					membank(bank_name)->set_entry(0);
					break;

				default:
					// work RAM
					//logerror("%04x-%04x: Work RAM (4K)\n", start_addr, end_addr);

					program.install_readwrite_bank(start_addr, end_addr, bank_name);
					membank(bank_name)->set_entry(0);
					break;
				}
			}
		}
	}

	if (m_fetch_charram)
	{
		// 30K block mapping

		UINT32 videoram_start = (m_hrs & 0xf0) << 11;

		for (bank = 1; bank <= 8; bank++)
		{
			// 0x0000-0x77FF is video RAM

			UINT16 start_addr = 0x1000 * (bank - 1);
			UINT16 end_addr = start_addr + 0xfff;
			UINT32 videoram_offset = (videoram_start + start_addr) & videoram_mask;
			sprintf(bank_name,"bank%d",bank);
			//logerror("%04x-%04x: Video RAM %04x (30K)\n", start_addr, end_addr, videoram_offset);

			if (start_addr == 0x7000)
			{
				program.install_readwrite_bank(0x7000, 0x77ff, bank_name);
				program.install_readwrite_handler(0x7800, 0x7fff, 0, 0, READ8_DELEGATE(abc806_state, charram_r), WRITE8_DELEGATE(abc806_state, charram_w));
			}
			else
			{
				program.install_readwrite_bank(start_addr, end_addr, bank_name);
			}

			membank(bank_name)->configure_entry(1, m_video_ram + videoram_offset);
			membank(bank_name)->set_entry(1);
		}
	}
}


//-------------------------------------------------
//  mai_r - memory bank map read
//-------------------------------------------------

READ8_MEMBER( abc806_state::mai_r )
{
	int bank = offset >> 12;

	return m_map[bank];
}


//-------------------------------------------------
//  mao_w - memory bank map write
//-------------------------------------------------

WRITE8_MEMBER( abc806_state::mao_w )
{
	/*

	    bit     description

	    0       physical block address bit 0
	    1       physical block address bit 1
	    2       physical block address bit 2
	    3       physical block address bit 3
	    4       physical block address bit 4
	    5
	    6
	    7       allocate block

	*/

	int bank = offset >> 12;

	m_map[bank] = data;

	bankswitch();
}



//**************************************************************************
//  ADDRESS MAPS
//**************************************************************************

//-------------------------------------------------
//  ADDRESS_MAP( abc800c_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( abc800c_mem, AS_PROGRAM, 8, abc800c_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x3fff) AM_RAM AM_SHARE("video_ram")
	AM_RANGE(0x4000, 0x7bff) AM_ROM
	AM_RANGE(0x7c00, 0x7fff) AM_RAM AM_SHARE("char_ram")
	AM_RANGE(0x8000, 0xffff) AM_RAM
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc800c_io )
//-------------------------------------------------

static ADDRESS_MAP_START( abc800c_io, AS_IO, 8, abc800_state )
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_MIRROR(0x18) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, inp_r, out_w)
	AM_RANGE(0x01, 0x01) AM_MIRROR(0x18) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, stat_r, cs_w)
	AM_RANGE(0x02, 0x02) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c1_w)
	AM_RANGE(0x03, 0x03) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c2_w)
	AM_RANGE(0x04, 0x04) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c3_w)
	AM_RANGE(0x05, 0x05) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c4_w)
	AM_RANGE(0x05, 0x05) AM_MIRROR(0x18) AM_READ(pling_r)
	AM_RANGE(0x06, 0x06) AM_MIRROR(0x18) AM_WRITE(hrs_w)
	AM_RANGE(0x07, 0x07) AM_MIRROR(0x18) AM_DEVREAD(ABCBUS_TAG, abcbus_slot_device, rst_r) AM_WRITE(hrc_w)
	AM_RANGE(0x20, 0x23) AM_MIRROR(0x0c) AM_DEVREADWRITE(Z80DART_TAG, z80dart_device, ba_cd_r, ba_cd_w)
	AM_RANGE(0x40, 0x43) AM_MIRROR(0x1c) AM_DEVREADWRITE(Z80SIO_TAG, z80sio2_device, ba_cd_r, ba_cd_w)
	AM_RANGE(0x60, 0x63) AM_MIRROR(0x1c) AM_DEVREADWRITE(Z80CTC_TAG, z80ctc_device, read, write)
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc800m_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( abc800m_mem, AS_PROGRAM, 8, abc800_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x3fff) AM_RAM AM_SHARE("video_ram")
	AM_RANGE(0x4000, 0x77ff) AM_ROM
	AM_RANGE(0x7800, 0x7fff) AM_RAM AM_SHARE("char_ram")
	AM_RANGE(0x8000, 0xffff) AM_RAM
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc800m_io )
//-------------------------------------------------

static ADDRESS_MAP_START( abc800m_io, AS_IO, 8, abc800_state )
	AM_IMPORT_FROM( abc800c_io )
	AM_RANGE(0x31, 0x31) AM_MIRROR(0x06) AM_DEVREAD(MC6845_TAG, mc6845_device, register_r)
	AM_RANGE(0x38, 0x38) AM_MIRROR(0x06) AM_DEVWRITE(MC6845_TAG, mc6845_device, address_w)
	AM_RANGE(0x39, 0x39) AM_MIRROR(0x06) AM_DEVWRITE(MC6845_TAG, mc6845_device, register_w)
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc802_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( abc802_mem, AS_PROGRAM, 8, abc802_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x77ff) AM_ROM
	AM_RANGE(0x7800, 0x7fff) AM_RAM AM_SHARE("char_ram")
	AM_RANGE(0x8000, 0xffff) AM_RAM
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc802_io )
//-------------------------------------------------

static ADDRESS_MAP_START( abc802_io, AS_IO, 8, abc802_state )
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_MIRROR(0x18) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, inp_r, out_w)
	AM_RANGE(0x01, 0x01) AM_MIRROR(0x18) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, stat_r, cs_w)
	AM_RANGE(0x02, 0x02) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c1_w)
	AM_RANGE(0x03, 0x03) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c2_w)
	AM_RANGE(0x04, 0x04) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c3_w)
	AM_RANGE(0x05, 0x05) AM_MIRROR(0x18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c4_w)
	AM_RANGE(0x05, 0x05) AM_MIRROR(0x08) AM_READ(pling_r)
	AM_RANGE(0x07, 0x07) AM_MIRROR(0x18) AM_DEVREAD(ABCBUS_TAG, abcbus_slot_device, rst_r)
	AM_RANGE(0x20, 0x23) AM_MIRROR(0x0c) AM_DEVREADWRITE(Z80DART_TAG, z80dart_device, ba_cd_r, ba_cd_w)
	AM_RANGE(0x31, 0x31) AM_MIRROR(0x06) AM_DEVREAD(MC6845_TAG, mc6845_device, register_r)
	AM_RANGE(0x38, 0x38) AM_MIRROR(0x06) AM_DEVWRITE(MC6845_TAG, mc6845_device, address_w)
	AM_RANGE(0x39, 0x39) AM_MIRROR(0x06) AM_DEVWRITE(MC6845_TAG, mc6845_device, register_w)
	AM_RANGE(0x40, 0x43) AM_MIRROR(0x1c) AM_DEVREADWRITE(Z80SIO_TAG, z80sio2_device, ba_cd_r, ba_cd_w)
	AM_RANGE(0x60, 0x63) AM_MIRROR(0x1c) AM_DEVREADWRITE(Z80CTC_TAG, z80ctc_device, read, write)
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc806_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( abc806_mem, AS_PROGRAM, 8, abc806_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x0fff) AM_RAMBANK("bank1")
	AM_RANGE(0x1000, 0x1fff) AM_RAMBANK("bank2")
	AM_RANGE(0x2000, 0x2fff) AM_RAMBANK("bank3")
	AM_RANGE(0x3000, 0x3fff) AM_RAMBANK("bank4")
	AM_RANGE(0x4000, 0x4fff) AM_RAMBANK("bank5")
	AM_RANGE(0x5000, 0x5fff) AM_RAMBANK("bank6")
	AM_RANGE(0x6000, 0x6fff) AM_RAMBANK("bank7")
	AM_RANGE(0x7000, 0x7fff) AM_RAMBANK("bank8")
	AM_RANGE(0x8000, 0x8fff) AM_RAMBANK("bank9")
	AM_RANGE(0x9000, 0x9fff) AM_RAMBANK("bank10")
	AM_RANGE(0xa000, 0xafff) AM_RAMBANK("bank11")
	AM_RANGE(0xb000, 0xbfff) AM_RAMBANK("bank12")
	AM_RANGE(0xc000, 0xcfff) AM_RAMBANK("bank13")
	AM_RANGE(0xd000, 0xdfff) AM_RAMBANK("bank14")
	AM_RANGE(0xe000, 0xefff) AM_RAMBANK("bank15")
	AM_RANGE(0xf000, 0xffff) AM_RAMBANK("bank16")
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc806_io )
//-------------------------------------------------

static ADDRESS_MAP_START( abc806_io, AS_IO, 8, abc806_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x00, 0x00) AM_MIRROR(0xff18) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, inp_r, out_w)
	AM_RANGE(0x01, 0x01) AM_MIRROR(0xff18) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, stat_r, cs_w)
	AM_RANGE(0x02, 0x02) AM_MIRROR(0xff18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c1_w)
	AM_RANGE(0x03, 0x03) AM_MIRROR(0xff18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c2_w)
	AM_RANGE(0x04, 0x04) AM_MIRROR(0xff18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c3_w)
	AM_RANGE(0x05, 0x05) AM_MIRROR(0xff18) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c4_w)
	AM_RANGE(0x06, 0x06) AM_MIRROR(0xff18) AM_WRITE(hrs_w)
	AM_RANGE(0x07, 0x07) AM_MIRROR(0xff18) AM_DEVREAD(ABCBUS_TAG, abcbus_slot_device, rst_r) AM_WRITE(hrc_w)
	AM_RANGE(0x20, 0x23) AM_MIRROR(0xff0c) AM_DEVREADWRITE(Z80DART_TAG, z80dart_device, ba_cd_r, ba_cd_w)
	AM_RANGE(0x31, 0x31) AM_MIRROR(0xff00) AM_DEVREAD(MC6845_TAG, mc6845_device, register_r)
	AM_RANGE(0x34, 0x34) AM_MIRROR(0xff00) AM_MASK(0xff00) AM_READWRITE(mai_r, mao_w)
	AM_RANGE(0x35, 0x35) AM_MIRROR(0xff00) AM_READWRITE(ami_r, amo_w)
	AM_RANGE(0x36, 0x36) AM_MIRROR(0xff00) AM_READWRITE(sti_r, sto_w)
	AM_RANGE(0x37, 0x37) AM_MIRROR(0xff00) AM_MASK(0xff00) AM_READWRITE(cli_r, sso_w)
	AM_RANGE(0x38, 0x38) AM_MIRROR(0xff00) AM_DEVWRITE(MC6845_TAG, mc6845_device, address_w)
	AM_RANGE(0x39, 0x39) AM_MIRROR(0xff00) AM_DEVWRITE(MC6845_TAG, mc6845_device, register_w)
	AM_RANGE(0x40, 0x43) AM_MIRROR(0xff1c) AM_DEVREADWRITE(Z80SIO_TAG, z80sio2_device, ba_cd_r, ba_cd_w)
	AM_RANGE(0x60, 0x63) AM_MIRROR(0xff1c) AM_DEVREADWRITE(Z80CTC_TAG, z80ctc_device, read, write)
ADDRESS_MAP_END



//**************************************************************************
//  INPUT PORTS
//**************************************************************************

//-------------------------------------------------
//  INPUT_PORTS( abc800 )
//-------------------------------------------------

INPUT_PORTS_START( abc800 )
	PORT_START("SB")
	PORT_DIPNAME( 0xff, 0xaa, "Serial Communications" ) PORT_DIPLOCATION("SB:1,2,3,4,5,6,7,8")
	PORT_DIPSETTING(    0xaa, "Asynchronous, Single Speed" )
	PORT_DIPSETTING(    0x2e, "Asynchronous, Split Speed" )
	PORT_DIPSETTING(    0x50, "Synchronous" )
	PORT_DIPSETTING(    0x8b, "ABC NET" )
INPUT_PORTS_END


//-------------------------------------------------
//  INPUT_PORTS( abc802 )
//-------------------------------------------------

static INPUT_PORTS_START( abc802 )
	PORT_START("SB")
	PORT_DIPNAME( 0xff, 0xaa, "Serial Communications" ) PORT_DIPLOCATION("SB:1,2,3,4,5,6,7,8")
	PORT_DIPSETTING(    0xaa, "Asynchronous, Single Speed" )
	PORT_DIPSETTING(    0x2e, "Asynchronous, Split Speed" )
	PORT_DIPSETTING(    0x50, "Synchronous" )
	PORT_DIPSETTING(    0x8b, "ABC NET" )

	PORT_START("CONFIG")
	PORT_DIPNAME( 0x01, 0x00, "Clear Screen Time Out" ) PORT_DIPLOCATION("S1:1")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x01, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) ) PORT_DIPLOCATION("S2:1")
	PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x02, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x00, "Characters Per Line" ) PORT_DIPLOCATION("S3:1")
	PORT_DIPSETTING(    0x00, "40" )
	PORT_DIPSETTING(    0x04, "80" )
	PORT_DIPNAME( 0x08, 0x08, "Frame Frequency" )
	PORT_DIPSETTING(    0x00, "60 Hz" )
	PORT_DIPSETTING(    0x08, "50 Hz" )
INPUT_PORTS_END


//-------------------------------------------------
//  INPUT_PORTS( abc806 )
//-------------------------------------------------

static INPUT_PORTS_START( abc806 )
	PORT_START("SB")
	PORT_DIPNAME( 0xff, 0xaa, "Serial Communications" ) PORT_DIPLOCATION("SB:1,2,3,4,5,6,7,8")
	PORT_DIPSETTING(    0xaa, "Asynchronous, Single Speed" )
	PORT_DIPSETTING(    0x2e, "Asynchronous, Split Speed" )
	PORT_DIPSETTING(    0x50, "Synchronous" )
	PORT_DIPSETTING(    0x8b, "ABC NET" )
INPUT_PORTS_END



//**************************************************************************
//  DEVICE CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  Z80CTC
//-------------------------------------------------

WRITE_LINE_MEMBER( abc800_state::ctc_z0_w )
{
	if (BIT(m_sb, 2))
	{
		m_sio->txca_w(state);
		m_ctc->trg3(state);
	}

	clock_cassette(state);
}

WRITE_LINE_MEMBER( abc800_state::ctc_z1_w )
{
	if (BIT(m_sb, 3))
	{
		m_sio->rxca_w(state);
	}

	if (BIT(m_sb, 4))
	{
		m_sio->txca_w(state);
		m_ctc->trg3(state);
	}
}

WRITE_LINE_MEMBER( abc800_state::ctc_z2_w )
{
	m_dart->rxca_w(state);
	m_dart->txca_w(state);
}

//-------------------------------------------------
//  Z80SIO
//-------------------------------------------------

void abc800_state::clock_cassette(int state)
{
	if (m_cassette == NULL) return;

	if (m_ctc_z0 && !state)
	{
		m_sio_txcb = !m_sio_txcb;
		m_sio->txcb_w(!m_sio_txcb);

		if (m_sio_txdb || m_sio_txcb)
		{
			m_dfd_out = !m_dfd_out;
			m_cassette->output((m_dfd_out & m_sio_rtsb) ? +1.0 : -1.0);
		}

		if (m_tape_ctr < 15)
		{
			m_tape_ctr++;
		}

		m_sio->rxcb_w(m_tape_ctr == 15);
	}

	m_ctc_z0 = state;
}

WRITE_LINE_MEMBER( abc800_state::sio_txdb_w )
{
	m_sio_txdb = state;
}

WRITE_LINE_MEMBER( abc800_state::sio_dtrb_w )
{
	if (m_cassette == NULL) return;

	if (state)
	{
		m_cassette->change_state(CASSETTE_MOTOR_ENABLED, CASSETTE_MASK_MOTOR);
		m_cassette_timer->enable(true);
	}
	else
	{
		m_cassette->change_state(CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
		m_cassette_timer->enable(false);
	}
}

WRITE_LINE_MEMBER( abc800_state::sio_rtsb_w )
{
	if (m_cassette == NULL) return;

	m_sio_rtsb = state;

	if (!m_sio_rtsb)
	{
		m_cassette->output(-1.0);
	}
}

//-------------------------------------------------
//  Z80DART abc802
//-------------------------------------------------

WRITE_LINE_MEMBER( abc802_state::lrs_w )
{
	m_lrs = state;

	bankswitch();
}

WRITE_LINE_MEMBER( abc802_state::mux80_40_w )
{
	m_80_40_mux = state;
}

//-------------------------------------------------
//  Z80DART abc806
//-------------------------------------------------

WRITE_LINE_MEMBER( abc806_state::keydtr_w )
{
	m_keydtr = state;

	bankswitch();
}

//-------------------------------------------------
//  z80_daisy_config abc800_daisy_chain
//-------------------------------------------------

static const z80_daisy_config abc800_daisy_chain[] =
{
	{ Z80CTC_TAG },
	{ Z80SIO_TAG },
	{ Z80DART_TAG },
	{ NULL }
};


//**************************************************************************
//  MACHINE INITIALIZATION
//**************************************************************************

//-------------------------------------------------
//  device_timer - handler timer events
//-------------------------------------------------

void abc800_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch (id)
	{
	case TIMER_ID_CTC:
		m_ctc->trg0(1);
		m_ctc->trg0(0);

		m_ctc->trg1(1);
		m_ctc->trg1(0);

		m_ctc->trg2(1);
		m_ctc->trg2(0);
		break;

	case TIMER_ID_CASSETTE:
		{
			int dfd_in = m_cassette->input() > 0;

			if (m_dfd_in && !dfd_in)
			{
				m_sio->rxb_w(!(m_tape_ctr == 15));
			}

			if (!dfd_in && (m_tape_ctr == 15))
			{
				m_tape_ctr = 4;
			}

			m_dfd_in = dfd_in;
		}
		break;
	}
}


//-------------------------------------------------
//  machine_start
//-------------------------------------------------

void abc800_state::machine_start()
{
	// start timers
	m_ctc_timer = timer_alloc(TIMER_ID_CTC);
	m_ctc_timer->adjust(attotime::from_hz(ABC800_X01/2/2/2), 0, attotime::from_hz(ABC800_X01/2/2/2));

	m_cassette_timer = timer_alloc(TIMER_ID_CASSETTE);
	m_cassette_timer->adjust(attotime::from_hz(44100), 0, attotime::from_hz(44100));
	m_cassette_timer->enable(false);

	// register for state saving
	save_item(NAME(m_fetch_charram));
	save_item(NAME(m_pling));
	save_item(NAME(m_sb));
	save_item(NAME(m_ctc_z0));
	save_item(NAME(m_sio_txcb));
	save_item(NAME(m_sio_txdb));
	save_item(NAME(m_sio_rtsb));
	save_item(NAME(m_dfd_out));
	save_item(NAME(m_dfd_in));
	save_item(NAME(m_tape_ctr));
}


//-------------------------------------------------
//  machine_reset
//-------------------------------------------------

void abc800_state::machine_reset()
{
	m_sb = m_io_sb->read();

	m_fetch_charram = 0;
	bankswitch();

	m_dart->ria_w(1);

	// 50/60 Hz
	m_dart->ctsb_w(0); // 0 = 50Hz, 1 = 60Hz

	m_dfd_in = 0;
}


//-------------------------------------------------
//  machine_start
//-------------------------------------------------

void abc802_state::machine_start()
{
	// start timers
	m_ctc_timer = timer_alloc(TIMER_ID_CTC);
	m_ctc_timer->adjust(attotime::from_hz(ABC800_X01/2/2/2), 0, attotime::from_hz(ABC800_X01/2/2/2));

	m_cassette_timer = timer_alloc(TIMER_ID_CASSETTE);
	m_cassette_timer->adjust(attotime::from_hz(44100), 0, attotime::from_hz(44100));

	// register for state saving
	save_item(NAME(m_pling));
	save_item(NAME(m_sb));
	save_item(NAME(m_ctc_z0));
	save_item(NAME(m_sio_txcb));
	save_item(NAME(m_sio_txdb));
	save_item(NAME(m_sio_rtsb));
	save_item(NAME(m_dfd_out));
	save_item(NAME(m_dfd_in));
	save_item(NAME(m_tape_ctr));
	save_item(NAME(m_lrs));
}


//-------------------------------------------------
//  machine_reset
//-------------------------------------------------

void abc802_state::machine_reset()
{
	UINT8 config = m_config->read();
	m_sb = m_io_sb->read();

	// memory banking
	m_lrs = 1;
	bankswitch();

	// clear screen time out (S1)
	m_sio->dcdb_w(BIT(config, 0));

	// unknown (S2)
	m_sio->ctsb_w(BIT(config, 1));

	// 40/80 char (S3)
	m_dart->ria_w(BIT(config, 2)); // 0 = 40, 1 = 80

	// 50/60 Hz
	m_dart->ctsb_w(BIT(config, 3)); // 0 = 50Hz, 1 = 60Hz

	m_dfd_in = 0;
}


//-------------------------------------------------
//  machine_start
//-------------------------------------------------

void abc806_state::machine_start()
{
	// start timers
	m_ctc_timer = timer_alloc(TIMER_ID_CTC);
	m_ctc_timer->adjust(attotime::from_hz(ABC800_X01/2/2/2), 0, attotime::from_hz(ABC800_X01/2/2/2));

	// setup memory banking
	UINT8 *mem = m_rom->base();
	UINT32 videoram_size = m_ram->size() - (32 * 1024);
	int bank;
	char bank_name[10];

	m_video_ram.allocate(videoram_size);

	for (bank = 1; bank <= 16; bank++)
	{
		sprintf(bank_name,"bank%d",bank);
		membank(bank_name)->configure_entry(0, mem + (0x1000 * (bank - 1)));
		membank(bank_name)->configure_entry(1, m_video_ram);
		membank(bank_name)->set_entry(0);
	}

	// register for state saving
	save_item(NAME(m_fetch_charram));
	save_item(NAME(m_pling));
	save_item(NAME(m_sb));
	save_item(NAME(m_ctc_z0));
	save_item(NAME(m_sio_txcb));
	save_item(NAME(m_sio_txdb));
	save_item(NAME(m_sio_rtsb));
	save_item(NAME(m_dfd_out));
	save_item(NAME(m_dfd_in));
	save_item(NAME(m_tape_ctr));
	save_item(NAME(m_keydtr));
	save_item(NAME(m_eme));
	save_item(NAME(m_map));
}


//-------------------------------------------------
//  machine_reset
//-------------------------------------------------

void abc806_state::machine_reset()
{
	m_sb = m_io_sb->read();

	// setup memory banking
	int bank;
	char bank_name[10];

	for (bank = 1; bank <= 16; bank++)
	{
		sprintf(bank_name,"bank%d",bank);
		membank(bank_name)->set_entry(0);
	}

	bankswitch();

	// clear STO lines
	m_eme = 0;
	m_40 = 0;
	m_hru2_a8 = 0;
	m_txoff = 0;
	m_rtc->cs_w(1);
	m_rtc->clk_w(1);
	m_rtc->dio_w(1);

	m_dart->ria_w(1);

	// 50/60 Hz
	m_dart->ctsb_w(0); // 0 = 50Hz, 1 = 60Hz

	m_dfd_in = 0;
}



//**************************************************************************
//  MACHINE DRIVERS
//**************************************************************************

//-------------------------------------------------
//  MACHINE_CONFIG( abc800c )
//-------------------------------------------------

static MACHINE_CONFIG_START( abc800c, abc800c_state )
	// basic machine hardware
	MCFG_CPU_ADD(Z80_TAG, Z80, ABC800_X01/2/2)
	MCFG_CPU_CONFIG(abc800_daisy_chain)
	MCFG_CPU_PROGRAM_MAP(abc800c_mem)
	MCFG_CPU_IO_MAP(abc800c_io)

	// video hardware
	MCFG_FRAGMENT_ADD(abc800c_video)

	// sound hardware
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD(DISCRETE_TAG, DISCRETE, 0)
	MCFG_SOUND_CONFIG_DISCRETE(abc800)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)

	// peripheral hardware
	MCFG_DEVICE_ADD(Z80CTC_TAG, Z80CTC, ABC800_X01/2/2)
	MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(abc800_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(abc800_state, ctc_z1_w))
	MCFG_Z80CTC_ZC2_CB(WRITELINE(abc800_state, ctc_z2_w))

	MCFG_Z80SIO2_ADD(Z80SIO_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_DTRB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_RTSB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_Z80DART_ADD(Z80DART_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(DEVWRITELINE(ABC_KEYBOARD_PORT_TAG, abc_keyboard_port_device, txd_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_CASSETTE_ADD("cassette")
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_MUTED)

	MCFG_RS232_PORT_ADD(RS232_A_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, ctsa_w))

	MCFG_RS232_PORT_ADD(RS232_B_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, ctsa_w))

	MCFG_ABC_KEYBOARD_PORT_ADD(ABC_KEYBOARD_PORT_TAG, "abc800")
	MCFG_ABC_KEYBOARD_OUT_RX_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxb_w))
	MCFG_ABC_KEYBOARD_OUT_TRXC_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxtxcb_w))
	MCFG_ABC_KEYBOARD_OUT_KEYDOWN_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcdb_w))

	// ABC bus
	MCFG_ABCBUS_SLOT_ADD(ABCBUS_TAG, abcbus_cards, "abc830")

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("16K")
	MCFG_RAM_EXTRA_OPTIONS("32K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("flop_list", "abc800")
	MCFG_SOFTWARE_LIST_ADD("hdd_list", "abc800_hdd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( abc800m )
//-------------------------------------------------

static MACHINE_CONFIG_START( abc800m, abc800m_state )
	// basic machine hardware
	MCFG_CPU_ADD(Z80_TAG, Z80, ABC800_X01/2/2)
	MCFG_CPU_CONFIG(abc800_daisy_chain)
	MCFG_CPU_PROGRAM_MAP(abc800m_mem)
	MCFG_CPU_IO_MAP(abc800m_io)

	// video hardware
	MCFG_FRAGMENT_ADD(abc800m_video)

	// sound hardware
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD(DISCRETE_TAG, DISCRETE, 0)
	MCFG_SOUND_CONFIG_DISCRETE(abc800)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)

	// peripheral hardware
	MCFG_DEVICE_ADD(Z80CTC_TAG, Z80CTC, ABC800_X01/2/2)
	MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(abc800_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(abc800_state, ctc_z1_w))
	MCFG_Z80CTC_ZC2_CB(WRITELINE(abc800_state, ctc_z2_w))

	MCFG_Z80SIO2_ADD(Z80SIO_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_DTRB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_RTSB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_Z80DART_ADD(Z80DART_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(DEVWRITELINE(ABC_KEYBOARD_PORT_TAG, abc_keyboard_port_device, txd_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_CASSETTE_ADD("cassette")
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_MUTED)

	MCFG_RS232_PORT_ADD(RS232_A_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, ctsa_w))

	MCFG_RS232_PORT_ADD(RS232_B_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, ctsa_w))

	MCFG_ABC_KEYBOARD_PORT_ADD(ABC_KEYBOARD_PORT_TAG, "abc800")
	MCFG_ABC_KEYBOARD_OUT_RX_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxb_w))
	MCFG_ABC_KEYBOARD_OUT_TRXC_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxtxcb_w))
	MCFG_ABC_KEYBOARD_OUT_KEYDOWN_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcdb_w))

	// ABC bus
	MCFG_ABCBUS_SLOT_ADD(ABCBUS_TAG, abcbus_cards, "abc830")

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("16K")
	MCFG_RAM_EXTRA_OPTIONS("32K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("flop_list", "abc800")
	MCFG_SOFTWARE_LIST_ADD("hdd_list", "abc800_hdd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( abc802 )
//-------------------------------------------------

static MACHINE_CONFIG_START( abc802, abc802_state )
	// basic machine hardware
	MCFG_CPU_ADD(Z80_TAG, Z80, ABC800_X01/2/2)
	MCFG_CPU_CONFIG(abc800_daisy_chain)
	MCFG_CPU_PROGRAM_MAP(abc802_mem)
	MCFG_CPU_IO_MAP(abc802_io)

	// video hardware
	MCFG_FRAGMENT_ADD(abc802_video)

	// sound hardware
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD(DISCRETE_TAG, DISCRETE, 0)
	MCFG_SOUND_CONFIG_DISCRETE(abc800)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.80)

	// peripheral hardware
	MCFG_DEVICE_ADD(Z80CTC_TAG, Z80CTC, ABC800_X01/2/2)
	MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(abc800_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(abc800_state, ctc_z1_w))
	MCFG_Z80CTC_ZC2_CB(WRITELINE(abc800_state, ctc_z2_w))

	MCFG_Z80SIO2_ADD(Z80SIO_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_DTRB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_RTSB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_Z80DART_ADD(Z80DART_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(DEVWRITELINE(ABC_KEYBOARD_PORT_TAG, abc_keyboard_port_device, txd_w))
	MCFG_Z80DART_OUT_DTRB_CB(WRITELINE(abc802_state, lrs_w))
	MCFG_Z80DART_OUT_RTSB_CB(WRITELINE(abc802_state, mux80_40_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_CASSETTE_ADD("cassette")
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_MUTED)

	MCFG_RS232_PORT_ADD(RS232_A_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, ctsa_w))

	MCFG_RS232_PORT_ADD(RS232_B_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, ctsa_w))

	MCFG_ABC_KEYBOARD_PORT_ADD(ABC_KEYBOARD_PORT_TAG, "abc55")
	MCFG_ABC_KEYBOARD_OUT_RX_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxb_w))
	MCFG_ABC_KEYBOARD_OUT_TRXC_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxtxcb_w))
	MCFG_ABC_KEYBOARD_OUT_KEYDOWN_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcdb_w))

	// ABC bus
	MCFG_ABCBUS_SLOT_ADD(ABCBUS_TAG, abcbus_cards, "abc834")

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("64K")

	// software list
	//MCFG_SOFTWARE_LIST_ADD("flop_list", "abc802")
	MCFG_SOFTWARE_LIST_ADD("hdd_list", "abc800_hdd")
MACHINE_CONFIG_END


//-------------------------------------------------
//  MACHINE_CONFIG( abc806 )
//-------------------------------------------------

static MACHINE_CONFIG_START( abc806, abc806_state )
	// basic machine hardware
	MCFG_CPU_ADD(Z80_TAG, Z80, ABC800_X01/2/2)
	MCFG_CPU_CONFIG(abc800_daisy_chain)
	MCFG_CPU_PROGRAM_MAP(abc806_mem)
	MCFG_CPU_IO_MAP(abc806_io)

	// video hardware
	MCFG_FRAGMENT_ADD(abc806_video)

	// peripheral hardware
	MCFG_E0516_ADD(E0516_TAG, ABC806_X02)

	MCFG_DEVICE_ADD(Z80CTC_TAG, Z80CTC, ABC800_X01/2/2)
	MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(abc800_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(abc800_state, ctc_z1_w))
	MCFG_Z80CTC_ZC2_CB(WRITELINE(abc800_state, ctc_z2_w))

	MCFG_Z80SIO2_ADD(Z80SIO_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_DTRB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_RTSB_CB(WRITELINE(abc800_state, sio_txdb_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_Z80DART_ADD(Z80DART_TAG, ABC800_X01/2/2, 0, 0, 0, 0 )
	MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_txd))
	MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_dtr))
	MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_rts))
	MCFG_Z80DART_OUT_TXDB_CB(DEVWRITELINE(ABC_KEYBOARD_PORT_TAG, abc_keyboard_port_device, txd_w))
	MCFG_Z80DART_OUT_DTRB_CB(WRITELINE(abc806_state, keydtr_w))
	MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))

	MCFG_RS232_PORT_ADD(RS232_A_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, ctsa_w))

	MCFG_RS232_PORT_ADD(RS232_B_TAG, default_rs232_devices, NULL)
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, rxa_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, dcda_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, ctsa_w))

	MCFG_ABC_KEYBOARD_PORT_ADD(ABC_KEYBOARD_PORT_TAG, "abc77")
	MCFG_ABC_KEYBOARD_OUT_RX_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxb_w))
	MCFG_ABC_KEYBOARD_OUT_TRXC_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, rxtxcb_w))
	MCFG_ABC_KEYBOARD_OUT_KEYDOWN_HANDLER(DEVWRITELINE(Z80DART_TAG, z80dart_device, dcdb_w))

	// ABC bus
	MCFG_ABCBUS_SLOT_ADD(ABCBUS_TAG, abcbus_cards, "abc832")

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("128K")
	MCFG_RAM_EXTRA_OPTIONS("512K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("flop_list", "abc806")
	MCFG_SOFTWARE_LIST_ADD("hdd_list", "abc800_hdd")
MACHINE_CONFIG_END



//**************************************************************************
//  ROMS
//**************************************************************************

/*

    ABC800 DOS ROMs

    Label       Drive Type
    ----------------------------
    ABC 6-1X    ABC830,DD82,DD84
    800 8"      DD88
    ABC 6-2X    ABC832
    ABC 6-3X    ABC838
    ABC 6-5X    UFD dos
    ABC 6-52    UFD dos with HD
    UFD 6.XX    Winchester


    Floppy Controllers

    Art N/O
    --------
    55 10761-01     "old" controller
    55 10828-01     "old" controller
    55 20900-0x
    55 21046-11     Luxor Conkort   25 pin D-sub connector
    55 21046-21     Luxor Conkort   34 pin FDD connector
    55 21046-41     Luxor Conkort   both of the above

*/

//-------------------------------------------------
//  ROM( abc800c )
//-------------------------------------------------

ROM_START( abc800c )
	ROM_REGION( 0x8000, Z80_TAG, 0 )
	ROM_LOAD( "abc c-1.1m", 0x0000, 0x1000, CRC(37009d29) SHA1(a1acd817ff8c2ed93935a163c5cf3d83d8bd6fb5) )
	ROM_LOAD( "abc 1-1.1l", 0x1000, 0x1000, CRC(ff15a28d) SHA1(bb4523ab1d190bc787f1923567b86795f66c26e2) )
	ROM_LOAD( "abc 2-1.1k", 0x2000, 0x1000, CRC(6ff2f528) SHA1(32d1639769c4a20b7a45c44f4c6993f77397f7a1) )
	ROM_LOAD( "abc 3-1.1j", 0x3000, 0x1000, CRC(9a43c47a) SHA1(964eb28e3d9779d1b13e0e938495133bbdb3aed3) )
	ROM_LOAD( "abc 4-1.2m", 0x4000, 0x1000, CRC(ba18db9c) SHA1(0c4543766fe9b10bee333f3f832f6f2209e449f8) )
	ROM_LOAD( "abc 5-1.2l", 0x5000, 0x1000, CRC(abbeb026) SHA1(44ebe417e3fa8d7878c23b56782aac8b443f1bfc) )
	ROM_LOAD( "abc 6-1.2k", 0x6000, 0x1000, CRC(4bd5e808) SHA1(5ca0a60571de6cfa3d6d166e0cde3c78560569f3) ) // 1981-01-12
	ROM_LOAD( "abc 7-22.2j", 0x7000, 0x1000, CRC(774511ab) SHA1(5171e43213a402c2d96dee33453c8306ac1aafc8) )

	ROM_REGION( 0x20, "hru", 0 )
	ROM_LOAD( "hru i.4g", 0x00, 0x20, CRC(d970a972) SHA1(c47fdd61fccc68368d42f03a01c7af90ab1fe1ab) )

	ROM_REGION( 0x200, "hru2", 0 )
	ROM_LOAD( "hru ii.3a", 0x000, 0x200, CRC(8e9d7cdc) SHA1(4ad16dc0992e31cdb2e644c7be81d334a56f7ad6) )
ROM_END


//-------------------------------------------------
//  ROM( abc800m )
//-------------------------------------------------

ROM_START( abc800m )
	ROM_REGION( 0x8000, Z80_TAG, 0 )
	ROM_DEFAULT_BIOS("ufd20")
	ROM_LOAD( "abc m-12.1m", 0x0000, 0x1000, CRC(f85b274c) SHA1(7d0f5639a528d8d8130a22fe688d3218c77839dc) )
	ROM_LOAD( "abc 1-12.1l", 0x1000, 0x1000, CRC(1e99fbdc) SHA1(ec6210686dd9d03a5ed8c4a4e30e25834aeef71d) )
	ROM_LOAD( "abc 2-12.1k", 0x2000, 0x1000, CRC(ac196ba2) SHA1(64fcc0f03fbc78e4c8056e1fa22aee12b3084ef5) )
	ROM_LOAD( "abc 3-12.1j", 0x3000, 0x1000, CRC(3ea2b5ee) SHA1(5a51ac4a34443e14112a6bae16c92b5eb636603f) )
	ROM_LOAD( "abc 4-12.2m", 0x4000, 0x1000, CRC(695cb626) SHA1(9603ce2a7b2d7b1cbeb525f5493de7e5c1e5a803) )
	ROM_LOAD( "abc 5-12.2l", 0x5000, 0x1000, CRC(b4b02358) SHA1(95338efa3b64b2a602a03bffc79f9df297e9534a) )
	ROM_SYSTEM_BIOS( 0, "13", "ABC-DOS (1982-07-19)" )
	ROMX_LOAD( "abc 6-13.2k", 0x6000, 0x1000, CRC(6fa71fb6) SHA1(b037dfb3de7b65d244c6357cd146376d4237dab6), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS( 1, "ufd19", "UFD-DOS v.19 (1983-05-31)" )
	ROMX_LOAD( "abc 6-11 ufd.2k", 0x6000, 0x1000, CRC(2a45be80) SHA1(bf08a18a74e8bdaee2656a3c8246c0122398b58f), ROM_BIOS(2) ) // is this "ABC 6-5" or "ABC 6-51" instead?
	ROM_SYSTEM_BIOS( 2, "ufd20", "UFD-DOS v.20 (1984-03-02)" )
	ROMX_LOAD( "abc 6-52.2k", 0x6000, 0x1000, CRC(c311b57a) SHA1(4bd2a541314e53955a0d53ef2f9822a202daa485), ROM_BIOS(3) )
	ROM_LOAD_OPTIONAL( "abc 7-21.2j", 0x7000, 0x1000, CRC(fd137866) SHA1(3ac914d90db1503f61397c0ea26914eb38725044) )
	ROM_LOAD( "abc 7-22.2j", 0x7000, 0x1000, CRC(774511ab) SHA1(5171e43213a402c2d96dee33453c8306ac1aafc8) )

	ROM_REGION( 0x800, MC6845_TAG, 0 )
	ROM_LOAD( "vum se.7c", 0x000, 0x800, CRC(f9152163) SHA1(997313781ddcbbb7121dbf9eb5f2c6b4551fc799) )

	ROM_REGION( 0x20, "hru", 0 )
	ROM_LOAD( "hru i.4g", 0x00, 0x20, CRC(d970a972) SHA1(c47fdd61fccc68368d42f03a01c7af90ab1fe1ab) )

	ROM_REGION( 0x200, "hru2", 0 )
	ROM_LOAD( "hru ii.3a", 0x000, 0x200, CRC(8e9d7cdc) SHA1(4ad16dc0992e31cdb2e644c7be81d334a56f7ad6) )
ROM_END


//-------------------------------------------------
//  ROM( abc802 )
//-------------------------------------------------

ROM_START( abc802 )
	ROM_REGION( 0x8000, Z80_TAG, 0 )
	ROM_DEFAULT_BIOS("ufd20")
	ROM_LOAD( "abc 02-11.9f",  0x0000, 0x2000, CRC(b86537b2) SHA1(4b7731ef801f9a03de0b5acd955f1e4a1828355d) )
	ROM_LOAD( "abc 12-11.11f", 0x2000, 0x2000, CRC(3561c671) SHA1(f12a7c0fe5670ffed53c794d96eb8959c4d9f828) )
	ROM_LOAD( "abc 22-11.12f", 0x4000, 0x2000, CRC(8dcb1cc7) SHA1(535cfd66c84c0370fd022d6edf702d3d1ad1b113) )
	ROM_SYSTEM_BIOS( 0, "abc", "ABC-DOS (1983-05-31)" )
	ROMX_LOAD( "abc 32-12.14f", 0x6000, 0x2000, CRC(23cd0f43) SHA1(639daec4565dcdb4de408b808d0c6cd97baa35d2), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS( 1, "ufd19", "UFD-DOS v.19 (1984-03-02)" )
	ROMX_LOAD( "abc 32-21.14f", 0x6000, 0x2000, CRC(57050b98) SHA1(b977e54d1426346a97c98febd8a193c3e8259574), ROM_BIOS(2) )
	ROM_SYSTEM_BIOS( 2, "ufd20", "UFD-DOS v.20 (1984-04-03)" )
	ROMX_LOAD( "abc 32-31.14f", 0x6000, 0x2000, CRC(fc8be7a8) SHA1(a1d4cb45cf5ae21e636dddfa70c99bfd2050ad60), ROM_BIOS(3) )
	ROM_SYSTEM_BIOS( 3, "mica620", "MICA DOS v.20 (1984-03-02)" )
	ROMX_LOAD( "mica820.14f",   0x6000, 0x2000, CRC(edf998af) SHA1(daae7e1ff6ef3e0ddb83e932f324c56f4a98f79b), ROM_BIOS(4) )

	ROM_REGION( 0x1000, MC6845_TAG, 0 )
	ROM_LOAD( "abc t02-1.3g", 0x0000, 0x1000, CRC(4d54eed8) SHA1(04cb5fc5f3d7ba9b9a5ae0ec94241d1fe83647f7) ) // 64 90191-01

	ROM_REGION( 0x400, "plds", 0 )
	ROM_LOAD( "abc p2-1.2g", 0x000, 0x400, NO_DUMP ) // PAL16R4
ROM_END


//-------------------------------------------------
//  ROM( abc806 )
//-------------------------------------------------

ROM_START( abc806 )
	ROM_REGION( 0x10000, Z80_TAG, 0 )
	ROM_DEFAULT_BIOS("ufd20")
	ROM_LOAD( "abc 06-11.1m",  0x0000, 0x1000, CRC(27083191) SHA1(9b45592273a5673e4952c6fe7965fc9398c49827) ) // BASIC PROM ABC 06-11 "64 90231-02"
	ROM_LOAD( "abc 16-11.1l",  0x1000, 0x1000, CRC(eb0a08fd) SHA1(f0b82089c5c8191fbc6a3ee2c78ce730c7dd5145) ) // BASIC PROM ABC 16-11 "64 90232-02"
	ROM_LOAD( "abc 26-11.1k",  0x2000, 0x1000, CRC(97a95c59) SHA1(013bc0a2661f4630c39b340965872bf607c7bd45) ) // BASIC PROM ABC 26-11 "64 90233-02"
	ROM_LOAD( "abc 36-11.1j",  0x3000, 0x1000, CRC(b50e418e) SHA1(991a59ed7796bdcfed310012b2bec50f0b8df01c) ) // BASIC PROM ABC 36-11 "64 90234-02"
	ROM_LOAD( "abc 46-11.2m",  0x4000, 0x1000, CRC(17a87c7d) SHA1(49a7c33623642b49dea3d7397af5a8b9dde8185b) ) // BASIC PROM ABC 46-11 "64 90235-02"
	ROM_LOAD( "abc 56-11.2l",  0x5000, 0x1000, CRC(b4b02358) SHA1(95338efa3b64b2a602a03bffc79f9df297e9534a) ) // BASIC PROM ABC 56-11 "64 90236-02"
	ROM_SYSTEM_BIOS( 0, "ufd19", "UFD-DOS v.19 (1984-03-02)" )
	ROMX_LOAD( "abc 66-21.2k", 0x6000, 0x1000, CRC(c311b57a) SHA1(4bd2a541314e53955a0d53ef2f9822a202daa485), ROM_BIOS(1) ) // DOS PROM ABC 66-21 "64 90314-01"
	ROM_SYSTEM_BIOS( 1, "ufd20", "UFD-DOS v.20 (1984-04-03)" )
	ROMX_LOAD( "abc 66-31.2k", 0x6000, 0x1000, CRC(a2e38260) SHA1(0dad83088222cb076648e23f50fec2fddc968883), ROM_BIOS(2) )
	ROM_SYSTEM_BIOS( 2, "mica20", "MICA DOS v.20 (1984-04-03)" )
	ROMX_LOAD( "mica2006.2k",  0x6000, 0x1000, CRC(58bc2aa8) SHA1(0604bd2396f7d15fcf3d65888b4b673f554037c0), ROM_BIOS(3) )
	ROM_SYSTEM_BIOS( 3, "catnet", "CAT-NET" )
	ROMX_LOAD( "cmd8_5.2k",    0x6000, 0x1000, CRC(25430ef7) SHA1(03a36874c23c215a19b0be14ad2f6b3b5fb2c839), ROM_BIOS(4) )
	ROM_LOAD_OPTIONAL( "abc 76-11.2j",  0x7000, 0x1000, CRC(3eb5f6a1) SHA1(02d4e38009c71b84952eb3b8432ad32a98a7fe16) ) // Options-PROM ABC 76-11 "64 90238-02"
	ROM_LOAD( "abc 76-xx.2j",  0x7000, 0x1000, CRC(b364cc49) SHA1(9a2c373778856a31902cdbd2ae3362c200a38e24) ) // Enhanced Options-PROM

	ROM_REGION( 0x1000, MC6845_TAG, 0 )
	ROM_LOAD( "abc t6-11.7c", 0x0000, 0x1000, CRC(b17c51c5) SHA1(e466e80ec989fbd522c89a67d274b8f0bed1ff72) ) // 64 90243-01

	ROM_REGION( 0x200, "rad", 0 )
	ROM_LOAD( "64 90241-01.9b", 0x000, 0x200, NO_DUMP ) // "RAD" 7621/7643 (82S131/82S137), character line address

	ROM_REGION( 0x20, "hru", 0 )
	ROM_LOAD( "64 90128-01.6e", 0x00, 0x20, NO_DUMP ) // "HRU I" 7603 (82S123), HR horizontal timing and video memory access

	ROM_REGION( 0x200, "hru2", 0 )
	ROM_LOAD( "64 90127-01.12g", 0x000, 0x200, CRC(8e9d7cdc) SHA1(4ad16dc0992e31cdb2e644c7be81d334a56f7ad6) ) // "HRU II" 7621 (82S131), ABC800C HR compatibility mode palette

	ROM_REGION( 0x400, "v50", 0 )
	ROM_LOAD( "64 90242-01.7e", 0x000, 0x200, NO_DUMP ) // "V50" 7621 (82S131), HR vertical timing 50Hz
	ROM_LOAD( "64 90319-01.7e", 0x200, 0x200, NO_DUMP ) // "V60" 7621 (82S131), HR vertical timing 60Hz

	ROM_REGION( 0x400, "plds", 0 )
	ROM_LOAD( "64 90225-01.11c", 0x000, 0x400, NO_DUMP ) // "VIDEO ATTRIBUTE" 40033A (?)
	ROM_LOAD( "64 90239-01.1b",  0x000, 0x400, NO_DUMP ) // "ABC P3-11" PAL16R4, color encoder
	ROM_LOAD( "64 90240-01.2d",  0x000, 0x400, NO_DUMP ) // "ABC P4-11" PAL16L8, memory mapper
ROM_END



//**************************************************************************
//  DRIVER INITIALIZATION
//**************************************************************************

//-------------------------------------------------
//  DRIVER_INIT( abc800c )
//-------------------------------------------------

DIRECT_UPDATE_MEMBER( abc800c_state::direct_update_handler )
{
	if (address >= 0x7c00 && address < 0x8000)
	{
		direct.explicit_configure(0x7c00, 0x7fff, 0x3ff, m_rom->base() + 0x7c00);

		if (!m_fetch_charram)
		{
			m_fetch_charram = 1;
			bankswitch();
		}

		return ~0;
	}

	if (m_fetch_charram)
	{
		m_fetch_charram = 0;
		bankswitch();
	}

	return address;
}

DRIVER_INIT_MEMBER(abc800c_state,driver_init)
{
	m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(abc800c_state::direct_update_handler), this));
}


//-------------------------------------------------
//  DRIVER_INIT( abc800m )
//-------------------------------------------------

DIRECT_UPDATE_MEMBER( abc800m_state::direct_update_handler )
{
	if (address >= 0x7800 && address < 0x8000)
	{
		direct.explicit_configure(0x7800, 0x7fff, 0x7ff, m_rom->base() + 0x7800);

		if (!m_fetch_charram)
		{
			m_fetch_charram = 1;
			bankswitch();
		}

		return ~0;
	}

	if (m_fetch_charram)
	{
		m_fetch_charram = 0;
		bankswitch();
	}

	return address;
}

DRIVER_INIT_MEMBER(abc800m_state,driver_init)
{
	m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(abc800m_state::direct_update_handler), this));
}


//-------------------------------------------------
//  DRIVER_INIT( abc802 )
//-------------------------------------------------

DIRECT_UPDATE_MEMBER( abc802_state::direct_update_handler )
{
	if (m_lrs)
	{
		if (address >= 0x7800 && address < 0x8000)
		{
			direct.explicit_configure(0x7800, 0x7fff, 0x7ff, m_rom->base() + 0x7800);
			return ~0;
		}
	}

	return address;
}

DRIVER_INIT_MEMBER(abc802_state,driver_init)
{
	m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(abc802_state::direct_update_handler), this));
}


//-------------------------------------------------
//  DRIVER_INIT( abc806 )
//-------------------------------------------------

DIRECT_UPDATE_MEMBER( abc806_state::direct_update_handler )
{
	if (address >= 0x7800 && address < 0x8000)
	{
		direct.explicit_configure(0x7800, 0x7fff, 0x7ff, m_rom->base() + 0x7800);

		if (!m_fetch_charram)
		{
			m_fetch_charram = 1;
			bankswitch();
		}

		return ~0;
	}

	if (m_fetch_charram)
	{
		m_fetch_charram = 0;
		bankswitch();
	}

	return address;
}

DRIVER_INIT_MEMBER(abc806_state,driver_init)
{
	m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(FUNC(abc806_state::direct_update_handler), this));
}



//**************************************************************************
//  SYSTEM DRIVERS
//**************************************************************************

//    YEAR  NAME        PARENT      COMPAT  MACHINE     INPUT   INIT                         COMPANY             FULLNAME        FLAGS
COMP( 1981, abc800c,    0,          0,      abc800c,    abc800, abc800c_state,  driver_init, "Luxor Datorer AB", "ABC 800 C/HR", GAME_SUPPORTS_SAVE )
COMP( 1981, abc800m,    abc800c,    0,      abc800m,    abc800, abc800m_state,  driver_init, "Luxor Datorer AB", "ABC 800 M/HR", GAME_SUPPORTS_SAVE )
COMP( 1983, abc802,     0,          0,      abc802,     abc802, abc802_state,   driver_init, "Luxor Datorer AB", "ABC 802",      GAME_SUPPORTS_SAVE )
COMP( 1983, abc806,     0,          0,      abc806,     abc806, abc806_state,   driver_init, "Luxor Datorer AB", "ABC 806",      GAME_SUPPORTS_SAVE | GAME_IMPERFECT_GRAPHICS )